4. Luis Figo - £37m | Barcelona to Real Madrid in 2000
Not only did this transfer smash the record set by Crespo, but it also proved to be the most controversial.
Swapping Barcelona for Real Madrid is almost unheard of, but for Los Blancos to smash the world transfer record in the process was quite a statement.
The move proved mutually beneficial - Barcelona could roll around in fifties whilst Madrid went on to win La Liga titles in 2001 and 2003, as well as enjoying Champions League success in 2002.